We study the processes eþ e− → ωχ bJ ð1PÞ (J ¼ 0, 1, or 2) using samples at center-of-mass energies pffiffiffi s ¼ 10.701, 10.745, and 10.805 GeV, corresponding to 1.6, 9.8, and 4.7 fb−1 of integrated luminosity, respectively. These data were collected with the Belle II detector during special operations of the SuperKEKB collider above the ϒð4SÞ resonance. We report the first observation of ωχ bJ ð1PÞ signals at pffiffiffi pffiffiffi s ¼ 10.745 GeV. By combining Belle II data with Belle results at s ¼ 10.867 GeV, we find energy dependencies of the Born cross sections for eþ e− → ωχ b1;b2 ð1PÞ to be consistent with the shape of the ϒð10753Þ state. These data indicate that the internal structures of the ϒð10753Þ and ϒð10860Þ states may pffiffiffi differ. Including data at s ¼ 10.653 GeV, we also search for the bottomonium equivalent of the Xð3872Þ state decaying into ωϒð1SÞ. No significant signal is observed for masses between 10.45 and 10.65 GeV=c2 .
Adachi, I., Aggarwal, L., Ahmed, H., Aihara, H., Akopov, N., Aloisio, A., et al. (2023). Observation of e+e−→ωχbJ(1P) and Search for Xb→ωϒ(1S) at s near 10.75 GeV. PHYSICAL REVIEW LETTERS, 130(9), 091902-1-091902-8 [10.1103/PhysRevLett.130.091902].
Observation of e+e−→ωχbJ(1P) and Search for Xb→ωϒ(1S) at s near 10.75 GeV
Bernieri, E.Membro del Collaboration Group
;Branchini, P.Membro del Collaboration Group
;Budano, A.Membro del Collaboration Group
;Bussino, S.Membro del Collaboration Group
;De Pietro, G.Membro del Collaboration Group
;Laurenza, M.Membro del Collaboration Group
;Martini, A.Membro del Collaboration Group
;
2023-01-01
Abstract
We study the processes eþ e− → ωχ bJ ð1PÞ (J ¼ 0, 1, or 2) using samples at center-of-mass energies pffiffiffi s ¼ 10.701, 10.745, and 10.805 GeV, corresponding to 1.6, 9.8, and 4.7 fb−1 of integrated luminosity, respectively. These data were collected with the Belle II detector during special operations of the SuperKEKB collider above the ϒð4SÞ resonance. We report the first observation of ωχ bJ ð1PÞ signals at pffiffiffi pffiffiffi s ¼ 10.745 GeV. By combining Belle II data with Belle results at s ¼ 10.867 GeV, we find energy dependencies of the Born cross sections for eþ e− → ωχ b1;b2 ð1PÞ to be consistent with the shape of the ϒð10753Þ state. These data indicate that the internal structures of the ϒð10753Þ and ϒð10860Þ states may pffiffiffi differ. Including data at s ¼ 10.653 GeV, we also search for the bottomonium equivalent of the Xð3872Þ state decaying into ωϒð1SÞ. No significant signal is observed for masses between 10.45 and 10.65 GeV=c2 .I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
